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Voltage‐controlled oscillator (VCO) is the most basic component required for all wireless and communication systems. In this article, a four‐stage differential ring VCO with two control voltages for wide tuning range is proposed. This VCO uses the dual‐delay loop technique for high operation frequency. Also, a low‐VT NMOS transistor is used in series with pull down network of the proposed VCO delay...
The start-up conditions for differential oscillator with an even number of stages are analyzed in this paper. Compared with those that have an odd number of stages, such oscillators may have two stable equilibrium states besides an astable equilibrium state in which the circuits can start to oscillate. To avoid the risk of possible latching up into the stable states, an additional start-up circuit...
This paper discusses an architecture for an integrated ultra-low power impulse radio receiver for low data rate applications such as biomedical sensor networks. Choosing a proper system architecture allows to implement a receiver with relaxed specifications for the typical building blocks which results in a low-power implementation. Furthermore a design in 130 nm CMOS of a fully integrated ultra-low...
A new phase noise model was used to optimize a differential ring VCO for minimum power consumption. We compare the phase noise performance of three buffer stages using clamped, symmetric and cross-coupled loads, respectively. We propose a cross-coupled buffer topology that achieves lower phase noise by exploiting symmetry. Measured phase noise for a 1.2 mW, 150 MHz VCO fabricated in 0.5 /spl mu/m...
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